write reader to nahfeldkommunikation for a passive rfid transponder

摘要

write device for nahfeldkommunikation for a passive rfid transponder (1) comprising a base write reader (2) with an integrated circuit (3), an oscillator (5) for generating a high frequency signal with a frequency f1 10 mhz in the a first antennenspule (4) is connected to the signal of the rfid transponder (1) is generated.the integrated circuit (3) antwortsignale from the rfid transponder (1) analyzes the signals, and a data transfer rate of more than 5 kbit / s), with the first antennenspule (4) is part of a first oscillatory circuit (6), with the first antennenspule as leiterplattenspule ausgebilde t,with the integrated circuit (3), a abgleichvorrichtung (7) to adjust the resonance frequency of the first oscillatory circuit (6) which, with the base writing device (2) for a communication with the transponder (1) in a coverage b allows, characterised by the fact that the basic writing reading device (2) a second antennenspule (8) is attached.the second part of an oscillatory circuit (9), to the frequency f1 is matched with the first circuit and inductive (6) is coupled with the koppelfaktor less than 0.1, and the second antennenspule (8) as leiterplattenspule is trained, whose surface is at least 5 times the area of the first antennenspule (4))so that the coverage of b by a factor of at least 1.5.